[joaquinbejar]

Summary

The last PR of the October 2026 issue programme: every workspace crate moves to 0.5.0 (make version VERSION=0.5.0). The programme carries breaking changes against 0.4.1, so this is a minor bump under 0.x semver. No issue or PR is left open.

What 0.5.0 contains

The work merged since 0.4.1 (#99 through #198), among it:

• Session core: the sans-IO session core and its handler split (Extract the reactor's decision logic into a sans-IO session core (session, engine) #91), with synchronous application and store traits (Add synchronous Application and MessageStore traits for the sans-IO path (engine, store) #92), a poll-driven driver without Tokio as an example (Add a poll-driven, non-Tokio driver example over the sans-IO core (example) #93), and the inbound header checks in the core (Move the inbound header checks into the sans-IO core (session) #189).
• Persistence:
  • durable store writes and FileStore (Make MessageStore sequence persistence fallible and add a fail-closed write policy (store, engine) #62, Add a persistent file-backed MessageStore (store) #78, FileStore: writer thread, dense index, counter slots and compaction (store) #112);
  • stores on the acceptor (Attach a MessageStore to the Acceptor for store-backed resend and sequence seeding (engine) #60) and a multi-session acceptor registry (Add a multi-session acceptor that routes inbound Logons by CompID (engine) #61);
  • durable owed reset and the inbound loss report (Make the owed-reset intent durable across a crash (engine, store) #111, Report or redeliver inbound messages lost across a crash (engine, store) #105);
  • standby resume (Should the engine support resuming a session on a standby process? (engine, store) #80).
• Wire and session behaviour:
  • 789 NextExpectedMsgSeqNum on Logon (Support NextExpectedMsgSeqNum (789) on Logon in both roles (engine) #79), the gap queue (Optionally queue out-of-order application messages during a gap (engine) #71), garbled-frame recovery (Ignore garbled inbound frames without consuming MsgSeqNum instead of closing the session (transport, engine) #66);
  • send outcomes and the outbound gate (Let to_app veto outbound messages and report per-message send outcomes (engine) #68), the throttle (Add an optional per-session outbound throttle for application messages (engine) #82), close reasons (Report a typed close reason to Application and Connection; Logout with Text (engine) #69), frame observer (Add a capture hook for every inbound and outbound frame (engine) #70);
  • TLS behind the tls feature (Add optional TLS for initiator and acceptor via rustls (engine) #81), inbound dictionary validation (Validate inbound application messages against a dictionary on the session path, with an Off/Log/Reject policy (engine, dictionary) #84).
• Allocations:
  • pooled outbound messages, plus a preallocated command queue: 0 blocks per send through a ready gate (Add an allocation-free outbound encode path (engine) #76);
  • a bounded field index, plus lent field buffers: no field list for wide messages (Decode into a caller-owned, bounded field index (tagvalue) #77).
• New crates: FIXP/SOFH (Add ironfix-sofh: Simple Open Framing Header codec (sofh) #94 to Add a FIXP/SOFH conformance test suite (fixp, engine) #97).
• Dictionary: FIX 4.2, FIXT 1.1 and FIX 5.0 SP2 embedded, a repeating-group reader, codegen views and an Orchestra loader (Embed FIX 4.2, FIXT 1.1 and FIX 5.0 SP2 dictionaries and compose transport with application (dictionary) #72 to Add a zero-copy, dictionary-driven repeating group reader (dictionary) #75, Generate borrowed view types, enums and writers from a Dictionary (codegen) #83, Load FIX Orchestra repositories into Dictionary (dictionary) #73, Generate shared component types so FIX 5.0 SP2 codegen output compiles (codegen) #98, Preserve XML member order in the dictionary schema (dictionary) #106).

Public / contract impact

Breaking against 0.4.1 by design. Among the breaks: #[non_exhaustive] SessionConfig (#66), the fallible async store trait (#62) and the non-exhaustive dictionary schema structs (#106). semver.yml checks 10 packages against their crates.io 0.4.1 baseline (not ironfix-derive, which it does not support, nor ironfix-sofh / ironfix-fixp, which have no published baseline yet), and a 0.5.0 version permits these breaks.

Nothing is published by this PR. cargo publish / make publish-all runs only after the owner confirms.

Testing

• Locally: cargo test --workspace --all-features 2657 passed, 0 failed; fmt, clippy -D warnings, make doc, check-spanish and cargo build --release --workspace all clean, with zero warnings.
• The full CI on this head is the release gate: per the owner, intermediate PRs merged on local gates, and this one waits for every workflow.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
ironfix-session/src/header.rs	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[joaquinbejar]

APPROVE. All 44 CI checks pass on the reviewed head, including tests, coverage, docs, lint, examples, Docker builds and semver. Workspace versions, internal dependencies, publish order and README snippets are consistent at 0.5.0. The documentation link is corrected. No findings. Submitted as COMMENT because GitHub prevents the author account from approving its own pull request.